code: def test_test_dataset_from_source(self):
      self.extraction.test_dataset["method"] = "source"
      self.extraction.test_dataset["source"] = "".join(
          [
              "from sklearn.datasets import load_digits\n",
              "def extract_test_dataset():\n",
              "    X, y = load_digits(return_X_y=True)\n",
              "    return X, y",
          ]
      )
      X, y = self.extraction.return_test_dataset()
      assert X.shape == (1797, 64)
      assert y.shape == (1797,)
  
file_path: xcessiv/xcessiv/tests/test_models.py
imports: from __future__ import absolute_import, print_function, division, unicode_literals
  import unittest
  from xcessiv import models
  from sklearn.ensemble import RandomForestClassifier
label_desc: Use image node_id 3 for calling the TestReturnTestDataFromJSON obj's underlying member method code with example usage: obj.test_test_dataset_from_source() without return types